Malicious PDF — malware analysis report

Static analysis result for SHA-256 79dd70451cde0d67…

MALICIOUS

PDF

34.2 KB Created: 2020-09-30 23:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 2919cef9d753dcbb96358ecd67591887 SHA-1: e5617e8b7e86aa60c270d1e738c9a78b975da368 SHA-256: 79dd70451cde0d67d919f0c99a222d396462db3fbf4760330a8f1412b9ef32d8
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gettraff.ru/strik?keyword=arabic+letters+with+pictures+pdf In PDF document text
    • http://digik.watersportsrep.com/uploads/1/3/1/8/131871921/6fd2d479c3507.pdfIn PDF document text
    • http://zexovade.thenaturalflame.com/uploads/1/3/1/4/131406258/xosubipoko.pdfIn PDF document text
    • http://files.hayesvilleumc.org/uploads/1/3/1/8/131871484/toxaropalesuj.pdfIn PDF document text
    • https://site-1037176.mozfiles.com/files/1037176/37875490474.pdfIn PDF document text
    • https://site-1036628.mozfiles.com/files/1036628/74846505998.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/31d70277-1a2a-4755-b268-9b66a3f667a7/bitaxapurajexojod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08b8a67f-52ef-4139-9c7a-457fab1408f2/19302230444.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cbd267e-86d7-4239-b1f9-3d8a4d8949fe/lazeburinumedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebeb9b71-1e45-4206-89d5-437566d2bd8d/gewemiwidazatixamesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63d00356-a825-4d00-9a95-099560275875/meposawevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34676e2d-0a99-4958-ae05-4a2b5938e42c/regovasapibofuwuwok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4dfe9d2-24a9-49f0-adb3-9473737b02e2/39206991327.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000482e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x482E 5464 bytes
SHA-256: b951d8d61eb40e92ad09fd22653d6bb56db75cffe9734cd325dd11faf62b3aec
font_01_sfnt_off00005ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC9 9640 bytes
SHA-256: 0b81f0d74796cad3ca535094377afbcd31cb531a5e2c19f34055928bd5ce1251